I have a '06 2500 HD 4x4 Duramaxx/Allison Chevy and pull an '07 36RLTS Jayco Designer whose dry weight is 11,700. We just took a trip and I noticed chunks of rubber missing from the front tires on the truck. This was not found on the back tires. I took it back to the dealership today and they are replacing the tires, but said they had never seen such an occurence before. Has anyone experienced this? Also, I am considering adding super springs to my truck. Does anyone have any pros/cons for this?